CODEWITHSUNDEEP
docker
Hello lad
Hello lad

Reputation: 18790

How to keep ubuntu image running?

I try to start container with following command

sudo docker run ubuntu

after that I checked with

sudo docker ps -a

found the container exited already

why does it exit?

How could I keep it running in backgroud without specifying -it and attach to it on demanding?

Upvotes: 19

Views: 20940

Answers (5)

mayanksoni121
mayanksoni121

Reputation: 101

You can add the tail command while running the container.

docker run -d ubuntu tail -f /dev/null

Upvotes: 3

Hello lad
Hello lad

Reputation: 18790

Solved by myself, a elegant way to keep the container running and waiting for further "attach" or "exec" is the following (to keep the STDIN open by -i option)

docker run -i -d ubuntu

Upvotes: 40

Michael
Michael

Reputation: 8683

You need to start an application with the docker run command that won't exit.

Example:

docker run -d --entrypoint '/bin/bash cat' ubuntu

Upvotes: 4

user2915097
user2915097

Reputation: 32216

the correct syntax is

(from docker run --help)

docker run [OPTIONS] IMAGE [COMMAND] [ARG...]

you have forgotten to specify a command.

You should have a look at the docker hub

https://registry.hub.docker.com/

For example for nginx, if you look at

https://hub.docker.com/_/nginx/

you will find

docker run --name some-nginx -v /some/nginx.conf:/etc/nginx/nginx.conf:ro -d nginx

If you look at

https://github.com/nginxinc/docker-nginx/blob/7f3ef0927ec619d20181e677c97f991df0d7d446/Dockerfile

you will notice that the last line of the Dockerfile is

CMD ["nginx", "-g", "daemon off;"]

This means that when you launch the docker image nginx, the implicit action is to start nginx.

Upvotes: 0

Kevin Simper
Kevin Simper

Reputation: 1707

If you want the container to not exist, you have to use the -d argument

So it look like this:

docker run -d ubuntu

Upvotes: -3

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